What does a sign BILL mean along a railroad track??

Question

We were riding along an active railroad line and saw a blue and white vertical sign saying "BILL". Does anyone know what that means??

Answer 1

I've never heard of that, but it may have been a local application.

On the railroads, blue and white signs mean "Men At Work", and have those words on them.  At night, a blue light means men at work.

You've got me curious now.  I hope someone knows.

Answer 2

Sure it didnt say HILL?

Answer 3

I'm with Hogger.

There are lots of signs for track workers and train crews but thats totally new to me.

Answer 4

I'v seen signs that say "BELL"...these are to remind you to "Make some noise", (Bell and Whistle), as dispatch says... for trackside workers...but IDK about BILL